Counterweight attachment for gas-engines.



No. 779,727. "PATENTED JAN.10, 1905. P. J. MILLER.

GOUNTERWEIGHT ATTACHMENT FOR GAS ENGINES.

APPLICATION nun In. 9, 1904.

2 SHEETS-SHEET 1.

No. 779,727. I PATENTED JAN. 10, 1905. F. J. MILLER.

G OUNTERWEIGHT ATTACHMENT FOR GAS ENGINES" APPLICATION FILED m. 9, 1904.

2 SHEETS-SHEET 2 UNITED STATES Fatented. J anuary 10, 1 905.

FRANK J. MILLER, OF CLEVELAND, OHIO.

COUNTERWEIGHT ATTACHMENT FOR GAS-ENGINES.

SPECIFICATION forming part of Letters Patent No. 779,727, dated January10, 1905.

Application filed March 9, 1904:. Serial No. 197,218. I

To all whom, it may concern:

Be it known that I, FRANK J. MILLER, acitizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented new and useful Improvements in Oounterweight Attachments forGas-Engines, of which the following is a specification.

This invention relates particularly to internal-combustion engines, andhas for its object to provide an improved counterweight to balance thepistons and cranks with intent to secure a perfect balance at any speed.

The invention is illustrated in the accompanying drawings, in which-Figure 1 is a vertical section of a vertical engine of the two-cylindertype provided with my improvement. Fig. 2 is a horizontal section on theline 2 2 of Fig. 1.

The engine illustrated is of the type having the cranks inclosed by acasing, and the trunkpistons are shown at A, arranged to reciprocate inthe cylinders B of any desired or suitable construction. The piston rodsC connect the pistons with the cranks E, which are contained within thecrank-casing H, bolted to the cylinders. The throw of both cranks, andconsequently the movement of the pistons, is the same.

he middle or counterweight crank I is located between the cranks E andhas opposite throw. It is connected by rod D to the counterweight F,which reciprocates between the cylinders upon vertical guides G, heldwithin an upper extension H of the casing H. The

, housing or extension H is cast in with the cylinders and forms achamber between the lower ends of the cylinders, which chamber is closedat the top and opens at the bottom into the crank or oil casing H. Thehousing is split and bolted together at the median vertical line betweenthe cylinders, and a con venient means of supporting the guides Grconsists in clamping a fin G thereon in the joint between the sectionsof the housing, whereby the guides lap and cover the joint. Thecounterweight F is properly shaped to suit the housing and the spacebetween the cylinders and at the top is made thin, as at F, to passbetween the water-jackets B around the heads of the cylinders.

In the preferable construction the counterweight F is made equal to theweight of the two pistons A, and the cranks and connecting-rods arebalanced in weight. The operation of the engine causes a travel of thecounterweight opposite to that of the pistons and gives a balance to themachine at any rate of speed with the known advantages incident thereto.The location of thecounterweight in a housingbetween the cylinders isconvenient and occupies very little space. The communication with theoil-casing below insures an effective lubrication of the guides.advantages of simplicity and design are ob- Vious.

What I claim as new, and desire to secure by Letters Patent, is

1. In an engine, the combination with a cylinder and single-actingpiston, and crank-shaft driven by the piston, the cylinder having guidessupported thereby, on the side thereof, of a reciprocating counterweightin the guides and connected to a crank on the shaft, to balance thepiston.

2. The combination of a cylinder and a crank-casing open thereto, thelatter having an extension with guides therein, a reciprocating pistonin the cylinder, a shaft in the easing having cranks of opposite throwto one of which the piston is connected, and a counterweightreciprocating in said guides and con nected to the other crank.

3. The combination of a pair of single-acting reciprocating engines, thecylinders of which are arranged side by side and the pistons of whichhave the same throw, of a counterweight reciprocating on guides betweenthe cylinders and connected to the shaft.

4- The combination of a pair of cylinders and pistons therein, acrank-casing into which the cylinders open, a shaft extending within thecasing and having cranks of the same The.

throw, connected to the pistons, and another to this specification inthe presence of two subcrank of opposite throw, a housing extendingscribing Witnesses.

from said casing inclosing the space between the cylinders, and havingguides, and a eoun- FRANK MILLER 5 terweight reciprocable in said guidesand eon- Witnesses:

nected to said othercrank. J N0. KUNZE,

In testimony whereof I have signed my name JOHN A. BOMMI-IARDT.

